Time-Resolved Spectroscopy of Bulk and Thin Film Structure and Dynamics

通过毫秒时间分辨的凝聚态光谱将进行飞秒，以了解固体和液体结构变化的动力学。结构相变之间的晶体相和结构演变的玻璃形成液体和聚合物将进行检查。结果将根据结构变化的理论模型进行分析，该模型描述了整个材料类别的行为，因此超越了单个材料，并根据分子模型试图通过考虑其显着特征来解释特定材料的行为。薄膜的机械和导热性能的测量也将进行。目的是了解界面的线性力学响应、破坏性测试测量的非线性响应（如剥落）以及界面化学和键合之间的关系。薄膜聚合物的研究工作将立即产生实际影响。所提出的方法允许非接触、非破坏性、快速原位测定用于微电子、保护涂层和其他应用的支撑或非支撑聚合物薄膜的机械和热性能（弹性和损失模量、热扩散系数）。如果非接触式粘附质量评估证明是可能的，这将为应用社区提供一个真正革命性的工具。＊＊＊

9317198 Nelson Femtosecond through millisecond time-resolved spectroscopy of condensed matter will be conducted to understand the dynamics of structural change in solids and liquids. Structural phase transitions between crystalline phases and structural evolution in glass-forming liquids and polymers will be examined. The results will be analyzed in terms of theoretical models of structural change, which describe the behavior of whole classes of materials and which therefore transcend individual materials, and in terms of molecular models which attempt to explain the behavior of specihc materials by taking their distinguishing characteristics into account. Measurements of the mechanical and thermal conductivity properties of thin films will also be performed. The goals will be to understand the relations between the linear mechanical response of the interface, the nonlinear response (e.g. peeling) measured by destructive tests, and the interface chemistry and bonding. The work on thin film polymers will have an immediate practical impact. The proposed method permits noncontact, nondestructive, rapid in situ determination of mechanical and thermal properties (elastic and loss moduli, thermal diffusivities) of supported or unsupported polymer films used in microelectronics, protective coatings, and other applications. If noncontact adhesion quality assessment proves possible, this will present a truly revolutionary tool to the applied community. ***